Furnace-door.



G. ONEILL.

. FURNAGE DOOR. APPLIOATION FILED oom?. 1909.

Patented Sept. 13, 1910.

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STATES 'PATIENT OFFICE.

GEORGE ONEILL, OF MONCTON, NEW BRUNSWICK, CANADA.

FURNACE-DOOR.

To all whom it may concern:

Be it known that I, GEORGE GNniLL, of Moncton, in the Province of NewBrunswick, Canada, have invented certain new and useful Improvements inFurnace- Doors, of which the following is a specification.

My invention relates to improvements in furnace doors of the typeadapted to admit air to the interior of the iire box to promotecombustion and eliminate smoke, and the objects of my invention are toprovide means insuring proper heating of the air before it is dischargedinto the tire box and further to generally simplify the construction ofthe door; and it consists essentially of a. door formed with an outerand inner liner section having central openings and a plurality ofspaced bailie plates between the sections, the said baille platesconducting the air alternately from the center to the outside. These andother features of the invention are more fully set forth and describedin the accompanying specifications and drawings.

In the drawings, Figure 1 is a front View of the door. Fig. 2 is a rearview. Fig. 3 is a transverse horizontal section. Fig. 4t is aperspective View of the iirst baille plate. Fig. 5 is a perspective viewof the second baile plate. Fig. 6 is a sectional detail on the line2--2, Fig. 1.

In the drawings like figures of reference indicate corresponding partsin each figure.

Referring to the drawings, A represents the outer section of the doorwhich will be substantially the same shape as the ordinary door atpresent used, that illustrated being the door for a locomotive boilerand being provided with suitable lugs 10 and 12 for hinging purposes,and a central latchin'g member 13. To admit air, the door is providedwith a suitable number of perforations 14 which will vary in size andnumber with the amount of air desired to be introduced, and this willdepend on the size of the furnace.

B represents the inner liner member, which is hollow and rovided with acentral aperture 15 throug which the air discharges on to the iire. Toincrease the heating surface of this member and also to direct the airtoward the discharge opening, the outer surface is provided with aplurality of radial corrugations 16.

Between the inner and outer members are a plurality of spaced bailleplates C and D Specification of Letters Patent.

Application filed October 7, 1909.

Patented Sept. 13, 1910.

serial No. 521,593.

formed with openings adapted to conduct the air alternately from thecenter to the outside. The first baille plate, in the embodimentillustrated, is provided with a central opening 17 and is formed withlugs 18 adapted to space it from the outer member A. The second plate Dis formed with recesses 19 around the edges and is spaced from the iirstbaille plate by means of integral dellecting plates E20 which serve thedouble function of spacing the baille plates and guiding the air currentdirectly from the center apertures to the outside recesses, which leaveopening between the edge of the baille plate and wall of the innermember. Bolts 21 are employed to hold the baille plates and inner andouter members together, the said bolts extending into lugs 9.2 on theinner member. To acconnnodate these lugs, the baille plates are providedwith notches 23 and Q4, and in order to prevent the air passing throughthese notches, the deflecting plates are so arranged that they willdeflect the current away from said notches.

In operation, the door is preferably used in conjunction with steaminjecting means such as described in my application of even dateherewith Serial No. 521,847, the air being drawn through the door by thenatural draft of the boiler and being comniingled with the steam, thecarbon particles and unconsumed products of combustion effecting a`secondary combustion in the fire box, thereby saving fuel andeliminating smoke.

Owing to the circuitous path which the air is forced to take in passingthrough the door, it is eii'ectually heated and thus, more readilyenters into combustion with the carbon particles. It will be observedthat the recesses 19 are spaced at equal intervals around the bailleplate D insuring that the air will be uniformly distributed to lthediil'erent sides, whereby each part of the door will give substantial anequal amount of heat to the air. It is also to be noted that the bailleplates 20, in addition to performing the function of deilecting the airfrom the lugs, guide the air directly from the outside to the centeropening and prevent dead air remaining in the corners.

As many changes could be made in the above construction and manyapparently, widely diii'erent embodiments of my inven tion, within thescope of the claims, could be made without departing from the spirit orscope thereof, it is intended that all matter contained in theaccompanying specifications and drawings, shall be interpreted as illus`trative and not in a limiting sense.

What I claim as my invention is:

1. A furnace door having a hollow lining member provided with a centralopening, said member being formed with radial corrugations around theopening adapted to direct the air toward the opening and at the sametime to increase the air heating surface.

2. An air admitting furnace door coinprising an outer member, an innermember having a central aperture, a baflie plate having a centralopening and being spaced from the outer member, and a second baffleplate spaced from the first baflie plate and provided with a pluralityof recesses around the periphery spaced at equal intervals and formingopenings between the edge of the baflie plate and the wall of the innermember, said openings being opposite imperforated portions on the firstmentioned bafiie plate, whereby the air will be forced to travelalternately from the center to the outside.y

3. An air admitting furnace door' com prising an outer member', an innerlining member having lugs thereon, bolts extending through the outermember to thelugs, a plurality of baffle plates in the lining member,one at least of which has delecting plates extending around the lugs,said inner and outer members being provided with suitable openings forthe inlet and outlet of air.

el. A11 air admitting furnace door comprising an outer member, an innerhollow lining member, a plurality of baffle plates in the lining memberhaving apertures alternately at the center and the outside. one of saidbaffle plates at least, being lprovided with deiecting plates projectingupwardly from the surface thereof and being adapted to guide the airdirectly from the center to the outside apertures.

In witness whereof I have hereunto set my hand in the presence of twowitnesses.

GEORGE ONEILL. Vitnesses M. J. HENDRICK, J. J. SWUMF.

